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Tagaya Double dam

Task
-Transport 600 concrete
-Transport 80 robot arms

Tagaya double dam is the largest flood control facility in the region, but as you can see, it has some flaws.
Yes, there is a small leak.
Action needs to be taken before the flooded areas spread.

tips:
Switchbacks are an old technology, but that doesn't mean they're obsolete.
You have plenty of time. Getting an S rank is not difficult.